Capability of Dongsha Massif as Provenance during Zhuhai-Zhujiang Formations

Key words: 
• Pearl River Mouth Basin /
• Dongsha massif /
• detrital materials /
• delta

Abstract: Comparing the seismic profiles, detrital material combinations and maturity, heavy mineral characteristics and sand ratio map from up and below the 18.5 Ma, which is the time line between the early and late stage of early Miocene, and stratigraphic boundary of the lower and upper Member of the Zhujiang Formation meaning while, in Dongsha massif, east of the Pearl River Mouth Basin, we can draw the conclusion that before 18.5 Ma, the Dongsha massif was still above the sea level and developed multiple flows radiated from the massif; as the sea-level rising , the massif lowed gradually, detrital materials from the Dongsha massif decreased while carbonate sources occupied, so reef appeared, and it peaked during 18.5 Ma to 16.5 Ma. After 16.5 Ma, the massif immersed as the prodelta of the Paleo-Zhujiang delta which sourced from northwest and prograded to the place, so the Dongsha massif lost the sources capability eventually.